Flue expander



May 26, 1925.

UNITED STATES CARL BUSH, F MAT-TOOK, ILLINGISL FLUE EXPANDER.

Application filed September 22, 1923. Serial No. 6S4l,303.

To all whom may concern:

Be it known that l, CARL BUSH, a citizen of the lhaited States, residingat Mattoon, in tllu county of Col-es and State of Illinois, haveinvented new and useful Improvements in lilue llxpanders, of which thefollowing is a specification.

This invention relates to a device for expanding the ends of boilerfines to properly hold them in assembled position relative to the endsor heads of a boiler, and an object of the invention is to provide anexpander which may be easily placed in the end of the line and expanded,to expand and crimp the ends of the flue and which also includes meansto facilitate the contraction and removal of the expander from the fluewithout in any way cit acting or mutilating the expanded and crimped endof the fine or loosening the tight connection between the line and theboiler end. I

Another object of this invention is to provide in combination with anexpansible .tlue expanding head a pin which is octagonal shaped in crosssection for expanding the head and also an extractor which is carried bythe expanding pin and is designed to be struck repeatedly by a pneumatichammer or like tool for loosening the flue expanding head and extractingit from a properly expanded flue.

Heretofore, considerable diii iculty has been experienced in theextracting or the removal of line expanding heads from boiler fines, andan object of the present invention is to provide a device for overcomingthese disadvantages by providing .an extractor which will, when it isstruck by the hammer be prevented from rota-ting relative to theexpanding head and will administer a slight transverse as well as alongitudinal action against the head.

Other objects of the invention will appear in the following detaileddescription taken in connection with theaccompanying drawing whereinFigure 1 is a side elevation partly in section of the improved expanderillustrating its use; and

Fig. 2 is a detail cross-section on the line 2-2 of Fig. 1.

Referring more particularly to the drawings, the improved flue expandercomprises an expanding head 1, which is formed of a plurality ofindividual sections 2 each of which is shaped, so that when assci'nblcdthey will expand the boiler fine as shown at' at the inner side of theboiler end 4:, and will crimp the outer end of the :flue against theouter surfaceot the plate 4 as shown at 5 for tightly connectingthe fiue3 with the plate t. The sections 2 of the expanding head 1 are held intheir proper relation one to the other by means of a spring band 6 whichextends about the sections outwardly of their flue forming or shapingportions. All of the sections, when assen'ibled' are arranged to providean axial bore which receives therethrough tapered end 7 of the wedgingpin 8. The wedging pin 8 is hexagonal or polygonal in cross section andit tapers inwardly towards its inner end, as clearly shown in Fig. 1 ofthe drawings.

The head 1 is prevented frompassing off the inner small end of the pin 8by means of an upset head 9. head 1 is on the reduced end of the pin 8the sections 2' will be in their contracted or innermost position whichwill permit them to be inserted into the end of the boiler tube Afterthe expanding head has been properly inserted into the boiler flue 3 thepin 8 is driven inwardly, preferably by means of a pneumatic hammerwhich forces the sections 2 outwardly, in all directions, and causes theforming of the bead 10 on the flue against the inner side of the plate 4and the crimping of the outer end of the flue at- 5 to properly wedgethe flue 3 in place. After the flue has been expanded, it will beapparent that the expanding head 1 will be tightly wedged in the fineand to release the expanding head from the fine, to permit thewithdrawal of the head a releasing member or extractor 12 is mountedupon the substantially straight end of the pin 8. The releasing member12 has a laterally ex tending projection 13 formed thereon whichincludes a rounded end portion 14 that projects beyond the end of themain body of the releasing member 12. To release the head 1, thepneumatic hammer or like tool (not shown) is placed to strike or applyits force against the rounded end 14 driving the member 12 against thehead and consequently forcing the pin 8 outwardly out of the head 1. Theball or rounded end 14 being disposed laterally of the axis of theoctagonal pin 8, and forwardly of the end of the member 12 will cause aslight lateral action of the "force against the octagonal pin, as

the

lVhen the expanding- Cal well as causing a longitudinal force againstthe head 1 which will increase the releasing or loosening action uponthe head to permit its withdrawal. By providing the octagonal pin 8, theextractor 12 will be prevented from spinning or turning around on thepin when it is struck with the hammer.

It is, of course, to be understood that'the invention may be constructedin other manners and the parts associated in difierent relations and,therefore, I do not desire to be limited in any manner except as setforth in the claims hereunto appended.

Having thus described my invention,

what I claim is:

1. In combination a flue expanderincluding an expansible head, a taperedexpanding pin polygonal shaped in crosssection, an extractor mountedupon said pin and provided with a polygonal bore for fitting about thepin, said extractor adapted to have pressure applied thereto to releasethe expansible flue expanding head, and means for preventingiremoval ofthe expansible head from the pin.

2. A flue expander comprising in combination, an expansible head, a pinpolygonal shaped in cross-section and having one end tapered, said pinadapted to be forced by pressure through the head for expanding a flue,an extractor mounted'upon said pin outwardly of said head and having apoly onal bore for snugly fitting the pin, alateral projection on theextractor having a rounded end portion adapted to receive force from atool, and an upset head on the tapered end of the pin to prevent removalof the expansible head from the pin.

In testimony whereof I afiix my signature. 7 CARL BUSH.

